Exam (elaborations)
2024 AQA A-LEVEL BIOLOGY GAS EXCHANGE EXAM QUESTIONS WITH CORRECT ANSWERS
- Course
- Institution
2024 AQA A-LEVEL BIOLOGY GAS EXCHANGE EXAM QUESTIONS WITH CORRECT ANSWERS
[Show more]
Content preview
2024 AQA A-LEVEL BIOLOGY GASEXCHANGE EXAM QUESTIONS
WITH CORRECT ANSWERS
Describe changes to the diaphragm upon inspiration. (2) - CORRECT-
ANSWERS- Diaphragm contracts
- And flattens
Explain how the diaphragm causes air to move into the lungs. (3) -
CORRECT-ANSWERS- Diaphragm contracts and flattens
- Increases the volume of the thorax
- Air moves down a pressure gradient and into the lungs
The diaphragm helps to bring abou the increase in the total volume of air
breathed out. Explain how. (3) - CORRECT-ANSWERS- Diaphragm relaxes
- Diaphragm domes
- Volume of the thorax decreases
Curve A could be used to find the total volume of air that this person could
breathe out in one complete breath. Describe how. (2) - CORRECT-ANSWERS-
Extrapolate/ extend the curve
- Read off where curve flattens
Destruction of pahgocytes causes the lungs ti be more suspectible to
infections. Explain why. (2) - CORRECT-ANSWERS- Phagocytes engulf and
destroy pathogens
- Lung infections are caused by inhaling phagocytes/fibres
The reduced elasticity of the lungs causes breathing difficulty. Explain how.
(2) - CORRECT-ANSWERS- MORE residual air in the lungs as they don't
deflate as much upon expiration
- Reduces OXYGEN concentration between the lungs and the environment
- Reduces rate of OXYGEN diffusion into the blood
Apart from reduced elasticity, explain how changes to the lung tissue reduce
the effiency of gas exchange. (4) - CORRECT-ANSWERS- Alevolar walls
thicken
- Longer diffusion pathway for gas exchange
- Scarred tissue
- Decreases surface area for gas exchange
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Elitaa. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83249 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now